Potassium hydroxide, also known as caustic potash, caustic soda and potassium ash, is a common chemical product with white powder or flake solid appearance. It is often seen in industry or laboratory. However, potassium hydroxide is a dangerous chemical with strong alkalinity and corrosiveness, which can also cause human poisoning.

　　強堿性及腐蝕性：其表現為在與皮膚接觸時會有燒灼作用，可溶解蛋白質，形成堿性變性蛋白質。溶液或粉塵濺到皮膚上，尤其濺到黏膜，可產生軟痂。溶液濃度越高，溫度越高，作用越強。濺入眼內，不僅可損傷角膜，而且能使眼部深組織損傷。

　　Strong alkalinity and corrosiveness: it can burn when contacting with skin, dissolve protein and form basic denatured protein. Solution or dust splashed on the skin, especially on the mucous membrane, can produce soft scabs. The higher the solution concentration, the higher the temperature and the stronger the effect. Splashing into the eyes can not only damage the cornea, but also damage the deep tissues of the eyes.

　　如果我們在使用時不小心發生接觸，要迅速進行自救應對：工作時應防止觸及皮膚和眼睛，如不慎觸及時，可用流水洗滌受損部位，然后濕敷5%的醋酸、酒石酸、鹽酸或檸檬酸溶液;如濺人眼內，應用流水或生理鹽水仔細緩慢洗滌10～30 min，然后點入2%的奴佛卡因或0.5%的地卡因溶液。操作時應穿由結實布制作的工作服，戴橡皮手套、袖套、圍裙，穿膠鞋等勞保用品，手上宜涂敷中性和疏水軟膏。

　　If contact happens accidentally when we use it, we should quickly carry out self rescue measures: prevent touching the skin and eyes during work, if it is touched in time, wash the damaged part with running water, and then wet 5% acetic acid, tartaric acid, hydrochloric acid or citric acid solution; if it splashes into the eyes, wash it carefully and slowly with running water or physiological saline for 10-30 minutes, and then point in 2% novocaine or 0.5 %Dicaine solution. During operation, workers shall wear work clothes made of strong cloth, rubber gloves, sleeves, apron, rubber shoes and other labor protection appliances, and apply neutral and hydrophobic ointment on their hands.

　　毒性：長期吸入少量會造成肺損害，其急性毒性為LD50273mg/kg(大鼠經口)。所以一定要避免長時間的從事氫氧化鉀相關工作，注意佩戴相應防具，盡量避免食入。如果不小心食入，要立即用水漱口，并用飲牛奶或蛋清，嚴重者立即就醫。

　　Toxicity: a small amount of long-term inhalation will cause lung damage, and its acute toxicity is ld50273mg / kg (rat oral). Therefore, it is necessary to avoid engaging in potassium hydroxide related work for a long time, pay attention to wear corresponding protective equipment and try to avoid ingestion. If you don't eat it carefully, rinse your mouth with water immediately and drink milk or egg white. If you are serious, see a doctor immediately.

　　由于氫氧化鉀還會污染水體，具有爆炸風險，在不慎發生泄露事故時要立即隔離泄漏污染區，限制出入。建議應急處理人員戴防塵面具(罩)，穿防酸堿工作服。不要直接接觸泄漏物。小量泄漏：用潔凈的鏟子收集于干燥、潔凈、有蓋的容器中。也可以用大量水沖洗，洗水稀釋后放入廢水系統。大量泄漏：收集回收或運廢物處理場所處置。

　　Because potassium hydroxide can also pollute water body, which has the risk of explosion, in case of leakage accident, it is necessary to immediately isolate the leakage pollution area and restrict access. It is recommended that the emergency treatment personnel wear dust mask (full mask) and acid and alkali resistant work clothes. Do not touch the leakage directly. Small leakage: collect in dry, clean and covered container with clean shovel. It can also be washed with a large amount of water, and then diluted into the waste water system. Large amount of leakage: collected and recovered or transported to the waste disposal site for disposal.